#----------------------------------------------------------- extern declarations
cdef extern from "Python.h":
    object PyString_FromStringAndSize (char * s, int len)

cdef extern from "string.h":
    int strlen(char *)    
    
cdef extern from "stdlib.h":
    
    ctypedef unsigned long size_t
    void free(void *ptr)
    void *malloc(size_t size)

cdef extern from "stdio.h":

    void printf(char *, ...)
    
cdef extern from "liblinear-1.32/linear.h":

    cdef extern int verbose_

    cdef struct feature_node:  
        int index
        double value

    cdef struct problem:
        int l, n, *y
        feature_node **x
        double bias

    cdef struct parameter:

        int solver_type

        # /* these are for training only */
        double eps	        #/* stopping criteria */
        double C
        int nr_weight
        int *weight_label
        double* weight


    cdef struct model:

        parameter param
        int nr_class		#/* number of classes */
        int nr_feature
        double *w
        int *label		#/* label of each class (label[n]) */
        double bias
        
    char *check_parameter(  problem *prob, parameter *param)
    model *train(problem *prob, parameter *param, int verbose)
    int predict(model *model_, feature_node *x)
    int predict_values(model *model_, feature_node *x, double *)
    int predict_probability(model *model_, feature_node *x, double* )
    void cross_validation(problem *prob, parameter *param, int nr_fold, int *target, int verbose)
    
    char * to_string(model * model_)
    model * from_string(char *)